Safety plug retainer



June 3 1924.

1,496,727 J. J. NELsoN SAFETY PLUG RETAINER Filed Dac. 29, .1922 S G I v n S l y I v '7 x4 K l i am/Mofaz l IS J1-J .I N ELSQN7. l5

Lping when it leaves the hole.

Patented June 3, 1924,

JOSEPH J'. NELSON, OF KENT, OHIO.

SAFETY PLUG RETAINER.

` Application filed December 29, 1.922.

To all whom t may concern Be it known that I, JOSEPH J. NELSON, a citizen of the United States, residing at Kent, in the county of Portage and State of Ohio, have invented certain new and useful Improvements in Safety Plug Retainers;

and I do hereby declare the following to be plug of a boiler, although the device can be I used kfor other purposes for which it is suitable, and an object of the invention is the provision of a simple, inexpensive and efcient device for retaining the plug in place against accidental displacement from its position in or at the hole provided for it. The

device will retain the plug in place even though the screw-threads give way, and, furthermore, when the plug is being unscrewed, the device will prevent the plugv from drop- It is also an object of the invention to provide such a device which can be incorporated in plug structures without prohibitive trouble or expense, so that the improvements can be embodied in boilers already'in use at moderate cost and little 4work for the installation.

IVith the foregoing and other objects in view, which will be apparent as the description proceeds, the invention resides in theconstruction and arrangement of parts, as hereinafter described and claimed, it being understood that changes can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein- Figure 1 is a median section of the plug and other parts, taken on the line 1*-1 of Fig. 2, portions being shown in elevation.

Fig. 2 is an inner or rear view.

Fig. 3 is an elevation of the plug and retainer member showing them in position for the insertion or removal of such member.

Serial No. 609,665.

In the drawing there is illustrated a wash-A out or clean-out plug 7 of a boiler, which screws into the hole 8 in the shell 9 of the boiler, although the illustration can be takenl as typical of any plug for which the device is appropriate.

The retainer member 10 comprises a bolt or rod having the screw-threaded 'terminal or stem 11 to project centrally through the hole, and the plug 7 is formed with a screw` threaded bore or hole 12 extending from its inner or rear end to receive the stem 11. The screw-threads of the stem 11 and bore 12 of the same pitch as `the screw-threads of the hole 8 and periphery of the plug, whereby the plug will screw on the stem 11 while4 being screwed into the hole 8, the axial rate of travel .of the plug for both sets of screwthreads being the same.

The retainer member 10 has its 'otherI terminal portion 13 bentback into the form of a hook, whereby the terminalportion' 13 can abut the inner surface of the wall orshell 9` at one side of the hole 8, preferably below said hole. The portion'or linger 13 abutting the shell or wall 9 will prevent'the member 10 from moving outwardly in the hole 8, and even though the screw threads between the plugs and shell 9 should give way by corrosion or weakening, the plug being threaded on the member 10 will'be heldin the hole, so as not to be blown out or dislodged.v In order to prevent the member 10 from turning when the plug is screwed into or out of the hole 8, a bifurcated or notched member 14 is disposed at the inner-surface of the shell or wall 9 at one side of the opening or hole 8, so that the notch thereof `can receive the endof the finger or portion 13, as seen in Figs. 1 and 2, to prevent the member 10 from turning. The member 14 has a stud 15 projecting into an aperture 16 formed in the wall or shell 9 at one side of the hole 8, and" said stud 15 is secured in the aperture 16 by the welded joint 17, or the like.

The retainer member will not only prevent the plug from being blown out or dislodged while in the hole 8, but vwill also prevent the plug from dropping when the plug is unscrewed. Thus, the stem 11 projects outwardly through the hole 8 beyond the outer surface of the shell or Wall 9, so that when the plug is completely unscrewed from the rshell or plate 9, it is still screwed on the retainer member, which prevents the plug from dropping. Now, by shiftingthe Q31, Lesen? plug transversely of its axis, as seen in Fig. 3, the retainer member can be withdrawn through the hole 8, the width of such member being slightly less than the dia-meter of the hole. This enables the plug and retainer member to be removed as a unit, and they are readily applied by inserting the retainer member through the hole with the plugl screwed partially on the stem l1'. The plug and retainer member are then shifted to bring the plug concentric with the hole 8, and to bring the linger or portion 13 in the notch' of the keeper member 14. Then, when the plug is turned it can be screwed on the stem ll and into the hole 8.

All that is necessary to incorporate the improvements is to provide the threaded bore 12in the plug and to fasten the member-14: tothe shell or seat 9.

Having thus described the invention, what is claimed as new is :u

l. A plug to screw in thev hole of a wall, and retaining means carried by the plug to abut` the inner surface of said wall and arranged to be removed through said hole with the plug.

2. A plug to screw in the hole of a wall, and a retainer memberto engage said wall having a screw-threaded connection with the plug and arranged to be removed through said hole with the plug.

3. A plug to Screw inthe hole in a wall. and retainer member threaded in the plug and having a portion to abut the inner surface of4 said wall, said member and portion thereof being arrangedr to. be removed throu h said hole with the plug.

4. plug having screw threads thereon to screw into a hole in a wall, and a retainer member havingv a screw-connection with the plug and a portion to engage said wall, the screw threads between said member .and plug being of the same pitch as the` first named screw threads of the plug, said member and portion thereof being arranged to be removed through said hole with the plus 5. Al plug' to screw into a hole in a wall,

and a retainer member having a terminaly screw-threaded in the plug and a bent back terminal `to abut the inner surface of said wall, saidmember bei-ng arranged to be removed through said hole with the plug.

6. A plug to be screw-threaded i-n a hole in a wall, a retainer member having7 a screw-threaded .coi'mect'iony with the plug and a portion rigid therewith to bear against the inner surface of said wall, said member and portion thereof being arranged to be removed through said hole with the plug, and a member to be disposed at the inner surface of said wall at one side of said hole to engage said portion of the retainer member to prevent the retainer member from turning.

7. A plug to screw into a hole in a wall, a retainer member having a terminal portion screw-threaded in the plug and having a rigid bent back terminal portion to abut the inner surface of said wall, said member being arranged.l to be removed through said hole with the plug, and a notched member to be carried by said wall at the inner surface thereof at oneside of said hole for receiving the lastv named terminal portion of said retainer member.

8. A retainer member for a plug having a threaded portion to engage the plug and :i portion to abut the inner surface of a wall in which the plug is screwed, said member being arranged to pass through the plug hole when carried by the plug.

9. A retainer member 'for a plug having a screw-threaded terminal on. which theplug can be screwed, and having a bent back terminal to abut the inner surface of a wall in which the plug` is screwed, said member being arranged to pass through the plug hole when carried by the plug.

l0. A retainer member for aplug having a screw-threaded terminal on which the plug can be screwed, and havinga bent back terminal to abut the inner surface` of a wall in which the plug is screwed, the irstfnamed terminal of the retainer member beingv suiiif ciently long toY project outwardly through a hole for the plug in said wal-l beyond the outer surface of the wall, said member being arranged to pass through the plug hole when carried by the plug.

lin testimony whereof I have signed my name to` this specification in the presence of two subscribing witnesses.

JOSEPH J. FELSON. l/Vitnesses:

BLAKE C. Coon, ESTHER E. NELSON. 

